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Diffstat (limited to 'cleopatre/linux-2.6.25.10-spc300/fs/nfs/inode.c')
-rw-r--r--cleopatre/linux-2.6.25.10-spc300/fs/nfs/inode.c1297
1 files changed, 1297 insertions, 0 deletions
diff --git a/cleopatre/linux-2.6.25.10-spc300/fs/nfs/inode.c b/cleopatre/linux-2.6.25.10-spc300/fs/nfs/inode.c
new file mode 100644
index 0000000000..6f88d7c77a
--- /dev/null
+++ b/cleopatre/linux-2.6.25.10-spc300/fs/nfs/inode.c
@@ -0,0 +1,1297 @@
+/*
+ * linux/fs/nfs/inode.c
+ *
+ * Copyright (C) 1992 Rick Sladkey
+ *
+ * nfs inode and superblock handling functions
+ *
+ * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
+ * experimental NFS changes. Modularisation taken straight from SYS5 fs.
+ *
+ * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
+ * J.S.Peatfield@damtp.cam.ac.uk
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/time.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/unistd.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/sunrpc/metrics.h>
+#include <linux/nfs_fs.h>
+#include <linux/nfs_mount.h>
+#include <linux/nfs4_mount.h>
+#include <linux/lockd/bind.h>
+#include <linux/smp_lock.h>
+#include <linux/seq_file.h>
+#include <linux/mount.h>
+#include <linux/nfs_idmap.h>
+#include <linux/vfs.h>
+#include <linux/inet.h>
+#include <linux/nfs_xdr.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+#include "nfs4_fs.h"
+#include "callback.h"
+#include "delegation.h"
+#include "iostat.h"
+#include "internal.h"
+
+#define NFSDBG_FACILITY NFSDBG_VFS
+
+#define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
+
+/* Default is to see 64-bit inode numbers */
+static int enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
+
+static void nfs_invalidate_inode(struct inode *);
+static int nfs_update_inode(struct inode *, struct nfs_fattr *);
+
+static void nfs_zap_acl_cache(struct inode *);
+
+static struct kmem_cache * nfs_inode_cachep;
+
+static inline unsigned long
+nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
+{
+ return nfs_fileid_to_ino_t(fattr->fileid);
+}
+
+/**
+ * nfs_compat_user_ino64 - returns the user-visible inode number
+ * @fileid: 64-bit fileid
+ *
+ * This function returns a 32-bit inode number if the boot parameter
+ * nfs.enable_ino64 is zero.
+ */
+u64 nfs_compat_user_ino64(u64 fileid)
+{
+ int ino;
+
+ if (enable_ino64)
+ return fileid;
+ ino = fileid;
+ if (sizeof(ino) < sizeof(fileid))
+ ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
+ return ino;
+}
+
+int nfs_write_inode(struct inode *inode, int sync)
+{
+ int ret;
+
+ if (sync) {
+ ret = filemap_fdatawait(inode->i_mapping);
+ if (ret == 0)
+ ret = nfs_commit_inode(inode, FLUSH_SYNC);
+ } else
+ ret = nfs_commit_inode(inode, 0);
+ if (ret >= 0)
+ return 0;
+ __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
+ return ret;
+}
+
+void nfs_clear_inode(struct inode *inode)
+{
+ /*
+ * The following should never happen...
+ */
+ BUG_ON(nfs_have_writebacks(inode));
+ BUG_ON(!list_empty(&NFS_I(inode)->open_files));
+ nfs_zap_acl_cache(inode);
+ nfs_access_zap_cache(inode);
+}
+
+/**
+ * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
+ */
+int nfs_sync_mapping(struct address_space *mapping)
+{
+ int ret;
+
+ if (mapping->nrpages == 0)
+ return 0;
+ unmap_mapping_range(mapping, 0, 0, 0);
+ ret = filemap_write_and_wait(mapping);
+ if (ret != 0)
+ goto out;
+ ret = nfs_wb_all(mapping->host);
+out:
+ return ret;
+}
+
+/*
+ * Invalidate the local caches
+ */
+static void nfs_zap_caches_locked(struct inode *inode)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ int mode = inode->i_mode;
+
+ nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
+
+ nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
+ nfsi->attrtimeo_timestamp = jiffies;
+
+ memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
+ if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
+ nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
+ else
+ nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
+}
+
+void nfs_zap_caches(struct inode *inode)
+{
+ spin_lock(&inode->i_lock);
+ nfs_zap_caches_locked(inode);
+ spin_unlock(&inode->i_lock);
+}
+
+void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
+{
+ if (mapping->nrpages != 0) {
+ spin_lock(&inode->i_lock);
+ NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
+ spin_unlock(&inode->i_lock);
+ }
+}
+
+static void nfs_zap_acl_cache(struct inode *inode)
+{
+ void (*clear_acl_cache)(struct inode *);
+
+ clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
+ if (clear_acl_cache != NULL)
+ clear_acl_cache(inode);
+ spin_lock(&inode->i_lock);
+ NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
+ spin_unlock(&inode->i_lock);
+}
+
+void nfs_invalidate_atime(struct inode *inode)
+{
+ spin_lock(&inode->i_lock);
+ NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
+ spin_unlock(&inode->i_lock);
+}
+
+/*
+ * Invalidate, but do not unhash, the inode.
+ * NB: must be called with inode->i_lock held!
+ */
+static void nfs_invalidate_inode(struct inode *inode)
+{
+ set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
+ nfs_zap_caches_locked(inode);
+}
+
+struct nfs_find_desc {
+ struct nfs_fh *fh;
+ struct nfs_fattr *fattr;
+};
+
+/*
+ * In NFSv3 we can have 64bit inode numbers. In order to support
+ * this, and re-exported directories (also seen in NFSv2)
+ * we are forced to allow 2 different inodes to have the same
+ * i_ino.
+ */
+static int
+nfs_find_actor(struct inode *inode, void *opaque)
+{
+ struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
+ struct nfs_fh *fh = desc->fh;
+ struct nfs_fattr *fattr = desc->fattr;
+
+ if (NFS_FILEID(inode) != fattr->fileid)
+ return 0;
+ if (nfs_compare_fh(NFS_FH(inode), fh))
+ return 0;
+ if (is_bad_inode(inode) || NFS_STALE(inode))
+ return 0;
+ return 1;
+}
+
+static int
+nfs_init_locked(struct inode *inode, void *opaque)
+{
+ struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
+ struct nfs_fattr *fattr = desc->fattr;
+
+ set_nfs_fileid(inode, fattr->fileid);
+ nfs_copy_fh(NFS_FH(inode), desc->fh);
+ return 0;
+}
+
+/* Don't use READDIRPLUS on directories that we believe are too large */
+#define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
+
+/*
+ * This is our front-end to iget that looks up inodes by file handle
+ * instead of inode number.
+ */
+struct inode *
+nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
+{
+ struct nfs_find_desc desc = {
+ .fh = fh,
+ .fattr = fattr
+ };
+ struct inode *inode = ERR_PTR(-ENOENT);
+ unsigned long hash;
+
+ if ((fattr->valid & NFS_ATTR_FATTR) == 0)
+ goto out_no_inode;
+
+ if (!fattr->nlink) {
+ printk("NFS: Buggy server - nlink == 0!\n");
+ goto out_no_inode;
+ }
+
+ hash = nfs_fattr_to_ino_t(fattr);
+
+ inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
+ if (inode == NULL) {
+ inode = ERR_PTR(-ENOMEM);
+ goto out_no_inode;
+ }
+
+ if (inode->i_state & I_NEW) {
+ struct nfs_inode *nfsi = NFS_I(inode);
+ unsigned long now = jiffies;
+
+ /* We set i_ino for the few things that still rely on it,
+ * such as stat(2) */
+ inode->i_ino = hash;
+
+ /* We can't support update_atime(), since the server will reset it */
+ inode->i_flags |= S_NOATIME|S_NOCMTIME;
+ inode->i_mode = fattr->mode;
+ /* Why so? Because we want revalidate for devices/FIFOs, and
+ * that's precisely what we have in nfs_file_inode_operations.
+ */
+ inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
+ if (S_ISREG(inode->i_mode)) {
+ inode->i_fop = &nfs_file_operations;
+ inode->i_data.a_ops = &nfs_file_aops;
+ inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
+ } else if (S_ISDIR(inode->i_mode)) {
+ inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
+ inode->i_fop = &nfs_dir_operations;
+ if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
+ && fattr->size <= NFS_LIMIT_READDIRPLUS)
+ set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
+ /* Deal with crossing mountpoints */
+ if (!nfs_fsid_equal(&NFS_SB(sb)->fsid, &fattr->fsid)) {
+ if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
+ inode->i_op = &nfs_referral_inode_operations;
+ else
+ inode->i_op = &nfs_mountpoint_inode_operations;
+ inode->i_fop = NULL;
+ set_bit(NFS_INO_MOUNTPOINT, &nfsi->flags);
+ }
+ } else if (S_ISLNK(inode->i_mode))
+ inode->i_op = &nfs_symlink_inode_operations;
+ else
+ init_special_inode(inode, inode->i_mode, fattr->rdev);
+
+ nfsi->read_cache_jiffies = fattr->time_start;
+ nfsi->last_updated = now;
+ nfsi->cache_change_attribute = now;
+ inode->i_atime = fattr->atime;
+ inode->i_mtime = fattr->mtime;
+ inode->i_ctime = fattr->ctime;
+ if (fattr->valid & NFS_ATTR_FATTR_V4)
+ nfsi->change_attr = fattr->change_attr;
+ inode->i_size = nfs_size_to_loff_t(fattr->size);
+ inode->i_nlink = fattr->nlink;
+ inode->i_uid = fattr->uid;
+ inode->i_gid = fattr->gid;
+ if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
+ /*
+ * report the blocks in 512byte units
+ */
+ inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
+ } else {
+ inode->i_blocks = fattr->du.nfs2.blocks;
+ }
+ nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
+ nfsi->attrtimeo_timestamp = now;
+ memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
+ nfsi->access_cache = RB_ROOT;
+
+ unlock_new_inode(inode);
+ } else
+ nfs_refresh_inode(inode, fattr);
+ dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
+ inode->i_sb->s_id,
+ (long long)NFS_FILEID(inode),
+ atomic_read(&inode->i_count));
+
+out:
+ return inode;
+
+out_no_inode:
+ dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
+ goto out;
+}
+
+#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
+
+int
+nfs_setattr(struct dentry *dentry, struct iattr *attr)
+{
+ struct inode *inode = dentry->d_inode;
+ struct nfs_fattr fattr;
+ int error;
+
+ nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
+
+ /* skip mode change if it's just for clearing setuid/setgid */
+ if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
+ attr->ia_valid &= ~ATTR_MODE;
+
+ if (attr->ia_valid & ATTR_SIZE) {
+ if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
+ attr->ia_valid &= ~ATTR_SIZE;
+ }
+
+ /* Optimization: if the end result is no change, don't RPC */
+ attr->ia_valid &= NFS_VALID_ATTRS;
+ if (attr->ia_valid == 0)
+ return 0;
+
+ lock_kernel();
+ /* Write all dirty data */
+ if (S_ISREG(inode->i_mode)) {
+ filemap_write_and_wait(inode->i_mapping);
+ nfs_wb_all(inode);
+ }
+ /*
+ * Return any delegations if we're going to change ACLs
+ */
+ if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
+ nfs_inode_return_delegation(inode);
+ error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
+ if (error == 0)
+ nfs_refresh_inode(inode, &fattr);
+ unlock_kernel();
+ return error;
+}
+
+/**
+ * nfs_setattr_update_inode - Update inode metadata after a setattr call.
+ * @inode: pointer to struct inode
+ * @attr: pointer to struct iattr
+ *
+ * Note: we do this in the *proc.c in order to ensure that
+ * it works for things like exclusive creates too.
+ */
+void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
+{
+ if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
+ if ((attr->ia_valid & ATTR_MODE) != 0) {
+ int mode = attr->ia_mode & S_IALLUGO;
+ mode |= inode->i_mode & ~S_IALLUGO;
+ inode->i_mode = mode;
+ }
+ if ((attr->ia_valid & ATTR_UID) != 0)
+ inode->i_uid = attr->ia_uid;
+ if ((attr->ia_valid & ATTR_GID) != 0)
+ inode->i_gid = attr->ia_gid;
+ spin_lock(&inode->i_lock);
+ NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
+ spin_unlock(&inode->i_lock);
+ }
+ if ((attr->ia_valid & ATTR_SIZE) != 0) {
+ nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
+ inode->i_size = attr->ia_size;
+ vmtruncate(inode, attr->ia_size);
+ }
+}
+
+static int nfs_wait_schedule(void *word)
+{
+ if (signal_pending(current))
+ return -ERESTARTSYS;
+ schedule();
+ return 0;
+}
+
+/*
+ * Wait for the inode to get unlocked.
+ */
+static int nfs_wait_on_inode(struct inode *inode)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ int error;
+
+ error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
+ nfs_wait_schedule, TASK_KILLABLE);
+
+ return error;
+}
+
+static void nfs_wake_up_inode(struct inode *inode)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ clear_bit(NFS_INO_REVALIDATING, &nfsi->flags);
+ smp_mb__after_clear_bit();
+ wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING);
+}
+
+int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
+{
+ struct inode *inode = dentry->d_inode;
+ int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
+ int err;
+
+ /*
+ * Flush out writes to the server in order to update c/mtime.
+ *
+ * Hold the i_mutex to suspend application writes temporarily;
+ * this prevents long-running writing applications from blocking
+ * nfs_wb_nocommit.
+ */
+ if (S_ISREG(inode->i_mode)) {
+ mutex_lock(&inode->i_mutex);
+ nfs_wb_nocommit(inode);
+ mutex_unlock(&inode->i_mutex);
+ }
+
+ /*
+ * We may force a getattr if the user cares about atime.
+ *
+ * Note that we only have to check the vfsmount flags here:
+ * - NFS always sets S_NOATIME by so checking it would give a
+ * bogus result
+ * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
+ * no point in checking those.
+ */
+ if ((mnt->mnt_flags & MNT_NOATIME) ||
+ ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
+ need_atime = 0;
+
+ if (need_atime)
+ err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
+ else
+ err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
+ if (!err) {
+ generic_fillattr(inode, stat);
+ stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
+ }
+ return err;
+}
+
+static struct nfs_open_context *alloc_nfs_open_context(struct vfsmount *mnt, struct dentry *dentry, struct rpc_cred *cred)
+{
+ struct nfs_open_context *ctx;
+
+ ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
+ if (ctx != NULL) {
+ ctx->path.dentry = dget(dentry);
+ ctx->path.mnt = mntget(mnt);
+ ctx->cred = get_rpccred(cred);
+ ctx->state = NULL;
+ ctx->lockowner = current->files;
+ ctx->flags = 0;
+ ctx->error = 0;
+ ctx->dir_cookie = 0;
+ atomic_set(&ctx->count, 1);
+ }
+ return ctx;
+}
+
+struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
+{
+ if (ctx != NULL)
+ atomic_inc(&ctx->count);
+ return ctx;
+}
+
+static void __put_nfs_open_context(struct nfs_open_context *ctx, int wait)
+{
+ struct inode *inode = ctx->path.dentry->d_inode;
+
+ if (!atomic_dec_and_lock(&ctx->count, &inode->i_lock))
+ return;
+ list_del(&ctx->list);
+ spin_unlock(&inode->i_lock);
+ if (ctx->state != NULL) {
+ if (wait)
+ nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
+ else
+ nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
+ }
+ if (ctx->cred != NULL)
+ put_rpccred(ctx->cred);
+ dput(ctx->path.dentry);
+ mntput(ctx->path.mnt);
+ kfree(ctx);
+}
+
+void put_nfs_open_context(struct nfs_open_context *ctx)
+{
+ __put_nfs_open_context(ctx, 0);
+}
+
+static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
+{
+ __put_nfs_open_context(ctx, 1);
+}
+
+/*
+ * Ensure that mmap has a recent RPC credential for use when writing out
+ * shared pages
+ */
+static void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
+{
+ struct inode *inode = filp->f_path.dentry->d_inode;
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ filp->private_data = get_nfs_open_context(ctx);
+ spin_lock(&inode->i_lock);
+ list_add(&ctx->list, &nfsi->open_files);
+ spin_unlock(&inode->i_lock);
+}
+
+/*
+ * Given an inode, search for an open context with the desired characteristics
+ */
+struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ struct nfs_open_context *pos, *ctx = NULL;
+
+ spin_lock(&inode->i_lock);
+ list_for_each_entry(pos, &nfsi->open_files, list) {
+ if (cred != NULL && pos->cred != cred)
+ continue;
+ if ((pos->mode & mode) == mode) {
+ ctx = get_nfs_open_context(pos);
+ break;
+ }
+ }
+ spin_unlock(&inode->i_lock);
+ return ctx;
+}
+
+static void nfs_file_clear_open_context(struct file *filp)
+{
+ struct inode *inode = filp->f_path.dentry->d_inode;
+ struct nfs_open_context *ctx = nfs_file_open_context(filp);
+
+ if (ctx) {
+ filp->private_data = NULL;
+ spin_lock(&inode->i_lock);
+ list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
+ spin_unlock(&inode->i_lock);
+ put_nfs_open_context_sync(ctx);
+ }
+}
+
+/*
+ * These allocate and release file read/write context information.
+ */
+int nfs_open(struct inode *inode, struct file *filp)
+{
+ struct nfs_open_context *ctx;
+ struct rpc_cred *cred;
+
+ cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
+ if (IS_ERR(cred))
+ return PTR_ERR(cred);
+ ctx = alloc_nfs_open_context(filp->f_path.mnt, filp->f_path.dentry, cred);
+ put_rpccred(cred);
+ if (ctx == NULL)
+ return -ENOMEM;
+ ctx->mode = filp->f_mode;
+ nfs_file_set_open_context(filp, ctx);
+ put_nfs_open_context(ctx);
+ return 0;
+}
+
+int nfs_release(struct inode *inode, struct file *filp)
+{
+ nfs_file_clear_open_context(filp);
+ return 0;
+}
+
+/*
+ * This function is called whenever some part of NFS notices that
+ * the cached attributes have to be refreshed.
+ */
+int
+__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
+{
+ int status = -ESTALE;
+ struct nfs_fattr fattr;
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
+ inode->i_sb->s_id, (long long)NFS_FILEID(inode));
+
+ nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
+ lock_kernel();
+ if (is_bad_inode(inode))
+ goto out_nowait;
+ if (NFS_STALE(inode))
+ goto out_nowait;
+
+ status = nfs_wait_on_inode(inode);
+ if (status < 0)
+ goto out;
+
+ status = -ESTALE;
+ if (NFS_STALE(inode))
+ goto out;
+
+ status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
+ if (status != 0) {
+ dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
+ inode->i_sb->s_id,
+ (long long)NFS_FILEID(inode), status);
+ if (status == -ESTALE) {
+ nfs_zap_caches(inode);
+ if (!S_ISDIR(inode->i_mode))
+ set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
+ }
+ goto out;
+ }
+
+ spin_lock(&inode->i_lock);
+ status = nfs_update_inode(inode, &fattr);
+ if (status) {
+ spin_unlock(&inode->i_lock);
+ dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
+ inode->i_sb->s_id,
+ (long long)NFS_FILEID(inode), status);
+ goto out;
+ }
+ spin_unlock(&inode->i_lock);
+
+ if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
+ nfs_zap_acl_cache(inode);
+
+ dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
+ inode->i_sb->s_id,
+ (long long)NFS_FILEID(inode));
+
+ out:
+ nfs_wake_up_inode(inode);
+
+ out_nowait:
+ unlock_kernel();
+ return status;
+}
+
+int nfs_attribute_timeout(struct inode *inode)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ if (nfs_have_delegation(inode, FMODE_READ))
+ return 0;
+ return !time_in_range(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
+}
+
+/**
+ * nfs_revalidate_inode - Revalidate the inode attributes
+ * @server - pointer to nfs_server struct
+ * @inode - pointer to inode struct
+ *
+ * Updates inode attribute information by retrieving the data from the server.
+ */
+int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
+{
+ if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
+ && !nfs_attribute_timeout(inode))
+ return NFS_STALE(inode) ? -ESTALE : 0;
+ return __nfs_revalidate_inode(server, inode);
+}
+
+static int nfs_invalidate_mapping_nolock(struct inode *inode, struct address_space *mapping)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ if (mapping->nrpages != 0) {
+ int ret = invalidate_inode_pages2(mapping);
+ if (ret < 0)
+ return ret;
+ }
+ spin_lock(&inode->i_lock);
+ nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
+ if (S_ISDIR(inode->i_mode))
+ memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
+ spin_unlock(&inode->i_lock);
+ nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
+ dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
+ inode->i_sb->s_id, (long long)NFS_FILEID(inode));
+ return 0;
+}
+
+static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
+{
+ int ret = 0;
+
+ mutex_lock(&inode->i_mutex);
+ if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_DATA) {
+ ret = nfs_sync_mapping(mapping);
+ if (ret == 0)
+ ret = nfs_invalidate_mapping_nolock(inode, mapping);
+ }
+ mutex_unlock(&inode->i_mutex);
+ return ret;
+}
+
+/**
+ * nfs_revalidate_mapping_nolock - Revalidate the pagecache
+ * @inode - pointer to host inode
+ * @mapping - pointer to mapping
+ */
+int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ int ret = 0;
+
+ if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
+ || nfs_attribute_timeout(inode) || NFS_STALE(inode)) {
+ ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
+ if (ret < 0)
+ goto out;
+ }
+ if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
+ ret = nfs_invalidate_mapping_nolock(inode, mapping);
+out:
+ return ret;
+}
+
+/**
+ * nfs_revalidate_mapping - Revalidate the pagecache
+ * @inode - pointer to host inode
+ * @mapping - pointer to mapping
+ *
+ * This version of the function will take the inode->i_mutex and attempt to
+ * flush out all dirty data if it needs to invalidate the page cache.
+ */
+int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ int ret = 0;
+
+ if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
+ || nfs_attribute_timeout(inode) || NFS_STALE(inode)) {
+ ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
+ if (ret < 0)
+ goto out;
+ }
+ if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
+ ret = nfs_invalidate_mapping(inode, mapping);
+out:
+ return ret;
+}
+
+static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ if ((fattr->valid & NFS_ATTR_WCC_V4) != 0 &&
+ nfsi->change_attr == fattr->pre_change_attr) {
+ nfsi->change_attr = fattr->change_attr;
+ if (S_ISDIR(inode->i_mode))
+ nfsi->cache_validity |= NFS_INO_INVALID_DATA;
+ }
+ /* If we have atomic WCC data, we may update some attributes */
+ if ((fattr->valid & NFS_ATTR_WCC) != 0) {
+ if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime))
+ memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
+ if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
+ memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
+ if (S_ISDIR(inode->i_mode))
+ nfsi->cache_validity |= NFS_INO_INVALID_DATA;
+ }
+ if (inode->i_size == nfs_size_to_loff_t(fattr->pre_size) &&
+ nfsi->npages == 0)
+ inode->i_size = nfs_size_to_loff_t(fattr->size);
+ }
+}
+
+/**
+ * nfs_check_inode_attributes - verify consistency of the inode attribute cache
+ * @inode - pointer to inode
+ * @fattr - updated attributes
+ *
+ * Verifies the attribute cache. If we have just changed the attributes,
+ * so that fattr carries weak cache consistency data, then it may
+ * also update the ctime/mtime/change_attribute.
+ */
+static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ loff_t cur_size, new_isize;
+ unsigned long invalid = 0;
+
+
+ /* Has the inode gone and changed behind our back? */
+ if (nfsi->fileid != fattr->fileid
+ || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
+ return -EIO;
+ }
+
+ /* Do atomic weak cache consistency updates */
+ nfs_wcc_update_inode(inode, fattr);
+
+ if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
+ nfsi->change_attr != fattr->change_attr)
+ invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
+
+ /* Verify a few of the more important attributes */
+ if (!timespec_equal(&inode->i_mtime, &fattr->mtime))
+ invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
+
+ cur_size = i_size_read(inode);
+ new_isize = nfs_size_to_loff_t(fattr->size);
+ if (cur_size != new_isize && nfsi->npages == 0)
+ invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
+
+ /* Have any file permissions changed? */
+ if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
+ || inode->i_uid != fattr->uid
+ || inode->i_gid != fattr->gid)
+ invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
+
+ /* Has the link count changed? */
+ if (inode->i_nlink != fattr->nlink)
+ invalid |= NFS_INO_INVALID_ATTR;
+
+ if (!timespec_equal(&inode->i_atime, &fattr->atime))
+ invalid |= NFS_INO_INVALID_ATIME;
+
+ if (invalid != 0)
+ nfsi->cache_validity |= invalid;
+ else
+ nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
+ | NFS_INO_INVALID_ATIME
+ | NFS_INO_REVAL_PAGECACHE);
+
+ nfsi->read_cache_jiffies = fattr->time_start;
+ return 0;
+}
+
+/**
+ * nfs_refresh_inode - try to update the inode attribute cache
+ * @inode - pointer to inode
+ * @fattr - updated attributes
+ *
+ * Check that an RPC call that returned attributes has not overlapped with
+ * other recent updates of the inode metadata, then decide whether it is
+ * safe to do a full update of the inode attributes, or whether just to
+ * call nfs_check_inode_attributes.
+ */
+int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ int status;
+
+ if ((fattr->valid & NFS_ATTR_FATTR) == 0)
+ return 0;
+ spin_lock(&inode->i_lock);
+ if (time_after(fattr->time_start, nfsi->last_updated))
+ status = nfs_update_inode(inode, fattr);
+ else
+ status = nfs_check_inode_attributes(inode, fattr);
+
+ spin_unlock(&inode->i_lock);
+ return status;
+}
+
+/**
+ * nfs_post_op_update_inode - try to update the inode attribute cache
+ * @inode - pointer to inode
+ * @fattr - updated attributes
+ *
+ * After an operation that has changed the inode metadata, mark the
+ * attribute cache as being invalid, then try to update it.
+ *
+ * NB: if the server didn't return any post op attributes, this
+ * function will force the retrieval of attributes before the next
+ * NFS request. Thus it should be used only for operations that
+ * are expected to change one or more attributes, to avoid
+ * unnecessary NFS requests and trips through nfs_update_inode().
+ */
+int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ spin_lock(&inode->i_lock);
+ nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
+ if (S_ISDIR(inode->i_mode))
+ nfsi->cache_validity |= NFS_INO_INVALID_DATA;
+ spin_unlock(&inode->i_lock);
+ return nfs_refresh_inode(inode, fattr);
+}
+
+/**
+ * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
+ * @inode - pointer to inode
+ * @fattr - updated attributes
+ *
+ * After an operation that has changed the inode metadata, mark the
+ * attribute cache as being invalid, then try to update it. Fake up
+ * weak cache consistency data, if none exist.
+ *
+ * This function is mainly designed to be used by the ->write_done() functions.
+ */
+int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
+{
+ if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
+ (fattr->valid & NFS_ATTR_WCC_V4) == 0) {
+ fattr->pre_change_attr = NFS_I(inode)->change_attr;
+ fattr->valid |= NFS_ATTR_WCC_V4;
+ }
+ if ((fattr->valid & NFS_ATTR_FATTR) != 0 &&
+ (fattr->valid & NFS_ATTR_WCC) == 0) {
+ memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
+ memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
+ fattr->pre_size = inode->i_size;
+ fattr->valid |= NFS_ATTR_WCC;
+ }
+ return nfs_post_op_update_inode(inode, fattr);
+}
+
+/*
+ * Many nfs protocol calls return the new file attributes after
+ * an operation. Here we update the inode to reflect the state
+ * of the server's inode.
+ *
+ * This is a bit tricky because we have to make sure all dirty pages
+ * have been sent off to the server before calling invalidate_inode_pages.
+ * To make sure no other process adds more write requests while we try
+ * our best to flush them, we make them sleep during the attribute refresh.
+ *
+ * A very similar scenario holds for the dir cache.
+ */
+static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
+{
+ struct nfs_server *server;
+ struct nfs_inode *nfsi = NFS_I(inode);
+ loff_t cur_isize, new_isize;
+ unsigned long invalid = 0;
+ unsigned long now = jiffies;
+
+ dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
+ __FUNCTION__, inode->i_sb->s_id, inode->i_ino,
+ atomic_read(&inode->i_count), fattr->valid);
+
+ if (nfsi->fileid != fattr->fileid)
+ goto out_fileid;
+
+ /*
+ * Make sure the inode's type hasn't changed.
+ */
+ if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
+ goto out_changed;
+
+ server = NFS_SERVER(inode);
+ /* Update the fsid? */
+ if (S_ISDIR(inode->i_mode) &&
+ !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
+ !test_bit(NFS_INO_MOUNTPOINT, &nfsi->flags))
+ server->fsid = fattr->fsid;
+
+ /*
+ * Update the read time so we don't revalidate too often.
+ */
+ nfsi->read_cache_jiffies = fattr->time_start;
+
+ nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ATIME
+ | NFS_INO_REVAL_PAGECACHE);
+
+ /* Do atomic weak cache consistency updates */
+ nfs_wcc_update_inode(inode, fattr);
+
+ /* More cache consistency checks */
+ if (!(fattr->valid & NFS_ATTR_FATTR_V4)) {
+ /* NFSv2/v3: Check if the mtime agrees */
+ if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
+ dprintk("NFS: mtime change on server for file %s/%ld\n",
+ inode->i_sb->s_id, inode->i_ino);
+ invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
+ if (S_ISDIR(inode->i_mode))
+ nfs_force_lookup_revalidate(inode);
+ }
+ /* If ctime has changed we should definitely clear access+acl caches */
+ if (!timespec_equal(&inode->i_ctime, &fattr->ctime))
+ invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
+ } else if (nfsi->change_attr != fattr->change_attr) {
+ dprintk("NFS: change_attr change on server for file %s/%ld\n",
+ inode->i_sb->s_id, inode->i_ino);
+ invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
+ if (S_ISDIR(inode->i_mode))
+ nfs_force_lookup_revalidate(inode);
+ }
+
+ /* Check if our cached file size is stale */
+ new_isize = nfs_size_to_loff_t(fattr->size);
+ cur_isize = i_size_read(inode);
+ if (new_isize != cur_isize) {
+ /* Do we perhaps have any outstanding writes, or has
+ * the file grown beyond our last write? */
+ if (nfsi->npages == 0 || new_isize > cur_isize) {
+ inode->i_size = new_isize;
+ invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
+ }
+ dprintk("NFS: isize change on server for file %s/%ld\n",
+ inode->i_sb->s_id, inode->i_ino);
+ }
+
+
+ memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
+ memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
+ memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
+ nfsi->change_attr = fattr->change_attr;
+
+ if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
+ inode->i_uid != fattr->uid ||
+ inode->i_gid != fattr->gid)
+ invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
+
+ inode->i_mode = fattr->mode;
+ inode->i_nlink = fattr->nlink;
+ inode->i_uid = fattr->uid;
+ inode->i_gid = fattr->gid;
+
+ if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
+ /*
+ * report the blocks in 512byte units
+ */
+ inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
+ } else {
+ inode->i_blocks = fattr->du.nfs2.blocks;
+ }
+
+ /* Update attrtimeo value if we're out of the unstable period */
+ if (invalid & NFS_INO_INVALID_ATTR) {
+ nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
+ nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
+ nfsi->attrtimeo_timestamp = now;
+ nfsi->last_updated = now;
+ } else {
+ if (!time_in_range(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
+ if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
+ nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
+ nfsi->attrtimeo_timestamp = now;
+ }
+ /*
+ * Avoid jiffy wraparound issues with nfsi->last_updated
+ */
+ if (!time_in_range(nfsi->last_updated, nfsi->read_cache_jiffies, now))
+ nfsi->last_updated = nfsi->read_cache_jiffies;
+ }
+ invalid &= ~NFS_INO_INVALID_ATTR;
+ /* Don't invalidate the data if we were to blame */
+ if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
+ || S_ISLNK(inode->i_mode)))
+ invalid &= ~NFS_INO_INVALID_DATA;
+ if (!nfs_have_delegation(inode, FMODE_READ) ||
+ (nfsi->cache_validity & NFS_INO_REVAL_FORCED))
+ nfsi->cache_validity |= invalid;
+ nfsi->cache_validity &= ~NFS_INO_REVAL_FORCED;
+
+ return 0;
+ out_changed:
+ /*
+ * Big trouble! The inode has become a different object.
+ */
+ printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
+ __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
+ out_err:
+ /*
+ * No need to worry about unhashing the dentry, as the
+ * lookup validation will know that the inode is bad.
+ * (But we fall through to invalidate the caches.)
+ */
+ nfs_invalidate_inode(inode);
+ return -ESTALE;
+
+ out_fileid:
+ printk(KERN_ERR "NFS: server %s error: fileid changed\n"
+ "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
+ NFS_SERVER(inode)->nfs_client->cl_hostname, inode->i_sb->s_id,
+ (long long)nfsi->fileid, (long long)fattr->fileid);
+ goto out_err;
+}
+
+
+#ifdef CONFIG_NFS_V4
+
+/*
+ * Clean out any remaining NFSv4 state that might be left over due
+ * to open() calls that passed nfs_atomic_lookup, but failed to call
+ * nfs_open().
+ */
+void nfs4_clear_inode(struct inode *inode)
+{
+ /* If we are holding a delegation, return it! */
+ nfs_inode_return_delegation_noreclaim(inode);
+ /* First call standard NFS clear_inode() code */
+ nfs_clear_inode(inode);
+}
+#endif
+
+struct inode *nfs_alloc_inode(struct super_block *sb)
+{
+ struct nfs_inode *nfsi;
+ nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
+ if (!nfsi)
+ return NULL;
+ nfsi->flags = 0UL;
+ nfsi->cache_validity = 0UL;
+#ifdef CONFIG_NFS_V3_ACL
+ nfsi->acl_access = ERR_PTR(-EAGAIN);
+ nfsi->acl_default = ERR_PTR(-EAGAIN);
+#endif
+#ifdef CONFIG_NFS_V4
+ nfsi->nfs4_acl = NULL;
+#endif /* CONFIG_NFS_V4 */
+ return &nfsi->vfs_inode;
+}
+
+void nfs_destroy_inode(struct inode *inode)
+{
+ kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
+}
+
+static inline void nfs4_init_once(struct nfs_inode *nfsi)
+{
+#ifdef CONFIG_NFS_V4
+ INIT_LIST_HEAD(&nfsi->open_states);
+ nfsi->delegation = NULL;
+ nfsi->delegation_state = 0;
+ init_rwsem(&nfsi->rwsem);
+#endif
+}
+
+static void init_once(struct kmem_cache * cachep, void *foo)
+{
+ struct nfs_inode *nfsi = (struct nfs_inode *) foo;
+
+ inode_init_once(&nfsi->vfs_inode);
+ INIT_LIST_HEAD(&nfsi->open_files);
+ INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
+ INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
+ INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
+ nfsi->ncommit = 0;
+ nfsi->npages = 0;
+ atomic_set(&nfsi->silly_count, 1);
+ INIT_HLIST_HEAD(&nfsi->silly_list);
+ init_waitqueue_head(&nfsi->waitqueue);
+ nfs4_init_once(nfsi);
+}
+
+static int __init nfs_init_inodecache(void)
+{
+ nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
+ sizeof(struct nfs_inode),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ init_once);
+ if (nfs_inode_cachep == NULL)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void nfs_destroy_inodecache(void)
+{
+ kmem_cache_destroy(nfs_inode_cachep);
+}
+
+/*
+ * Initialize NFS
+ */
+static int __init init_nfs_fs(void)
+{
+ int err;
+
+ err = nfs_fs_proc_init();
+ if (err)
+ goto out5;
+
+ err = nfs_init_nfspagecache();
+ if (err)
+ goto out4;
+
+ err = nfs_init_inodecache();
+ if (err)
+ goto out3;
+
+ err = nfs_init_readpagecache();
+ if (err)
+ goto out2;
+
+ err = nfs_init_writepagecache();
+ if (err)
+ goto out1;
+
+ err = nfs_init_directcache();
+ if (err)
+ goto out0;
+
+#ifdef CONFIG_PROC_FS
+ rpc_proc_register(&nfs_rpcstat);
+#endif
+ if ((err = register_nfs_fs()) != 0)
+ goto out;
+ return 0;
+out:
+#ifdef CONFIG_PROC_FS
+ rpc_proc_unregister("nfs");
+#endif
+ nfs_destroy_directcache();
+out0:
+ nfs_destroy_writepagecache();
+out1:
+ nfs_destroy_readpagecache();
+out2:
+ nfs_destroy_inodecache();
+out3:
+ nfs_destroy_nfspagecache();
+out4:
+ nfs_fs_proc_exit();
+out5:
+ return err;
+}
+
+static void __exit exit_nfs_fs(void)
+{
+ nfs_destroy_directcache();
+ nfs_destroy_writepagecache();
+ nfs_destroy_readpagecache();
+ nfs_destroy_inodecache();
+ nfs_destroy_nfspagecache();
+#ifdef CONFIG_PROC_FS
+ rpc_proc_unregister("nfs");
+#endif
+ unregister_nfs_fs();
+ nfs_fs_proc_exit();
+}
+
+/* Not quite true; I just maintain it */
+MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
+MODULE_LICENSE("GPL");
+module_param(enable_ino64, bool, 0644);
+
+module_init(init_nfs_fs)
+module_exit(exit_nfs_fs)